Fire alarm system device for building engineering construction

Abstract

The invention relates to the technical field of constructional engineering construction, in particular to a fire alarm system device for constructional engineering construction, and the device comprises a smoke detection module which detects smoke particles in the air of a constructional engineering construction site, and outputs an electric signal corresponding to the smoke particle concentration to a controller; the temperature detection module detects the environment temperature of a building engineering construction site and outputs an electric signal corresponding to the environment temperature to the controller. When the voltage value of the electric signal corresponding to the smoke particle concentration is greater than a first preset voltage value and the voltage value of the electric signal corresponding to the environment temperature is greater than a second preset voltage value, the controller outputs a conduction signal to the switch module; when the switch module receives the conduction signal, a power supply loop between the power supply and the alarm module is conducted; and when the power supply loop is switched on, the alarm module carries out fire alarm on the building engineering construction site, so that the reliability and the accuracy of the fire alarm system are improved.

Description

Technical Field

[0001] The invention relates to the technical field of building engineering construction, and in particular to a fire alarm system device used in building engineering construction. Background Art

[0002] At construction sites, due to the complexity and diversity of construction activities, there are often a lot of interference factors such as dust and smoke in the environment. These interference factors not only pose a threat to the health of workers, but may also affect the normal operation of the fire alarm system. During the construction process, such as cutting, welding, concrete mixing and other processes, a large amount of dust and smoke will be generated. These tiny particles will be mistakenly identified as fire signals by the detectors of the fire alarm system, resulting in false alarms.

[0003] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0004] The main purpose of the present invention is to provide a fire alarm system device for construction engineering, aiming to solve the technical problem in the prior art that there are many interference factors such as dust and smoke at the construction site of the construction engineering, which easily lead to false alarms of fire alarms.

[0005] To achieve the above object, the present invention provides a fire alarm system device for construction engineering, the device comprising: a smoke detection module, a temperature detection module, a controller, a switch module and an alarm module;

[0006] The smoke detection module is connected to the first input terminal of the controller, the temperature detection module is connected to the second input terminal of the controller, the output terminal of the controller is connected to the switch module, and the switch module is connected to the power supply and the alarm module respectively;

[0007] The smoke detection module is used to detect smoke particles in the air at the construction site of the building project and output an electrical signal corresponding to the concentration of the smoke particles to the controller;

[0008] The temperature detection module is used to detect the ambient temperature of the construction site of the building project and output an electrical signal corresponding to the ambient temperature to the controller;

[0009] The controller is used to output a conduction signal to the switch module when the voltage value of the electrical signal corresponding to the smoke particle concentration is greater than a first preset voltage value and the voltage value of the electrical signal corresponding to the ambient temperature is greater than a second preset voltage value;

[0010] The switch module is used to conduct the power supply circuit between the power supply and the alarm module when receiving the conduction signal;

[0011] The alarm module is used to send out a fire alarm at the construction site of the building project when the power supply circuit is turned on.

[0012] Optionally, the smoke detection module includes a light emitting diode and a photoelectric receiver, and the smoke particles in the air of the construction site are detected, and an electrical signal corresponding to the concentration of the smoke particles is output to the controller, including:

[0013] Detecting the scattered light intensity, incident light intensity, scattering coefficient and optical path length of smoke particles in the air at the construction site of the building project by means of the light emitting diode and the photoelectric receiver;

[0014] Determine the smoke concentration through a relationship expression between the light scattering intensity and the smoke concentration based on the scattered light intensity, the incident light intensity, the scattering coefficient and the optical path length, and output an electrical signal corresponding to the smoke particle concentration to the controller;

[0015] The relationship between the light scattering intensity and the smoke concentration is expressed as:

[0016] I=I0.e -kcd ;

[0017] Where I is the scattered light intensity, I0 is the incident light intensity, k is the scattering coefficient, C is the smoke particle concentration, and d is the optical path length.

[0018] Optionally, the fire alarm system device for building engineering construction further includes: a wireless communication module;

[0019] The wireless communication module is connected to the controller and the terminal device respectively;

[0020] The controller is further configured to output a fire alarm signal at the construction site of the building project to the wireless communication module when the power supply circuit is turned on;

[0021] The wireless communication module is used to send the fire alarm information to the terminal device by wireless transmission when receiving the fire alarm signal.

[0022] Optionally, the device further comprises a solar panel and a power battery, wherein the solar panel is connected to the controller and the power battery respectively, and the power battery is connected to the controller;

[0023] The controller is also used to detect the battery power of the power battery, and when the battery power of the power battery is less than a preset battery power, control the solar panel to charge the power battery.

[0024] Optionally, the fire alarm system device for building engineering construction further includes: a voltage dividing module and a voltage stabilizing module;

[0025] Wherein, the voltage dividing module is connected to the power supply and the voltage stabilizing module respectively, and the voltage stabilizing module is connected to the light detection module;

[0026] The voltage dividing module is used to divide the power supply voltage provided by the power supply to obtain a divided voltage, and send the divided voltage to the voltage stabilizing module;

[0027] The voltage stabilization module is used to stabilize the divided voltage and send the stabilized divided voltage to the temperature detection module;

[0028] The temperature detection module is also used to adjust the divided voltage after stabilization to obtain an electrical signal corresponding to the ambient temperature.

[0029] Optionally, the temperature detection module includes: a first resistor, which is a thermistor;

[0030] The first end of the first resistor is connected to the power supply through the voltage stabilizing module and the voltage dividing module, and the second end of the first resistor is connected to the second input end of the controller.

[0031] Optionally, the controller includes: a first comparator, a second comparator and an AND gate;

[0032] Wherein, the positive input terminal of the first comparator is connected to the second terminal of the first resistor, the reverse input terminal of the first comparator is connected to a first preset reference power supply, the output terminal of the first comparator is connected to the first input terminal of the AND gate, the positive input terminal of the second comparator is connected to the smoke detection module, the reverse input terminal of the second comparator is connected to the second preset reference power supply, the output terminal of the second comparator is connected to the second input terminal of the AND gate, and the output terminal of the AND gate is connected to the switch module.

[0033] Optionally, the switch module includes: a first switch tube and a second resistor;

[0034] Among them, the first end of the second resistor is connected to the power supply, the second end of the second resistor is connected to the input end of the first switch tube, the control end of the first switch tube is connected to the output end of the AND gate, and the output end of the first switch tube is connected to the alarm module.

[0035] Optionally, the alarm module includes: a light emitting diode and a buzzer;

[0036] The output end of the first switch tube is connected to the anode of the light emitting diode and the buzzer respectively, and the cathode of the light emitting diode is grounded.

[0037] Optionally, the voltage dividing module includes: a third resistor and a fourth resistor, and the voltage stabilizing module includes: a first capacitor;

[0038] Among them, the first end of the third resistor is connected to the power supply, the second end of the third resistor is connected to the first end of the fourth resistor, the first end of the fourth resistor is also connected to the first end of the first resistor and the first end of the first capacitor, and the second end of the fourth resistor and the second end of the first capacitor are grounded.

[0039] The present invention provides a fire alarm system device for construction of a building project, the device comprising: a smoke detection module, a temperature detection module, a controller, a switch module and an alarm module; wherein the smoke detection module is connected to a first input end of the controller, the temperature detection module is connected to a second input end of the controller, the output end of the controller is connected to the switch module, and the switch module is connected to a power supply and the alarm module respectively; the smoke detection module is used to detect smoke particles in the air at a construction site of the building project, and output an electrical signal corresponding to the smoke particle concentration to the controller; the temperature detection module is used to detect the ambient temperature at the construction site of the building project, and output an electrical signal corresponding to the ambient temperature to the controller; the controller is used to output a conduction signal to the switch module when the voltage value of the electrical signal corresponding to the smoke particle concentration is greater than a first preset voltage value and the voltage value of the electrical signal corresponding to the ambient temperature is greater than a second preset voltage value; the switch module is used to conduct a power supply circuit between the power supply and the alarm module when receiving the conduction signal; the alarm module is used to conduct a fire alarm at the construction site of the building project when the power supply circuit is conducted. This system decides whether to sound a fire alarm by comprehensively considering smoke concentration and temperature changes, effectively reducing the risk of false alarms caused by dust and smoke interference at the construction site, thereby improving the reliability and accuracy of the fire alarm system. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a structural schematic diagram of an embodiment of a fire alarm system device used in building engineering construction according to the present invention;

[0041] Figure 2 It is a structural schematic diagram of another embodiment of a fire alarm system device used in building engineering construction according to the present invention;

[0042] Figure 3 The present invention is a circuit schematic diagram of a fire alarm system device used in building engineering construction.

[0043] Description of Figure Numbers:

[0044]

[0045]

[0046] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0047] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0048] Reference Figures 1 to 3 , the present invention proposes a fire alarm system device for building engineering construction, the device comprising: a smoke detection module 10, a temperature detection module 20, a controller 30, a switch module 40 and an alarm module 50;

[0049] The smoke detection module 10 is connected to the first input terminal of the controller 30, the temperature detection module 20 is connected to the second input terminal of the controller 30, the output terminal of the controller 30 is connected to the switch module 40, and the switch module 40 is respectively connected to the power supply and the alarm module 50;

[0050] The smoke detection module 10 is used to detect smoke particles in the air at the construction site of the building project and output an electrical signal corresponding to the concentration of the smoke particles to the controller 30;

[0051] The temperature detection module 20 is used to detect the ambient temperature of the construction site of the building project and output an electrical signal corresponding to the ambient temperature to the controller 30;

[0052] The controller 30 is used to output a conduction signal to the switch module 40 when the voltage value of the electrical signal corresponding to the smoke particle concentration is greater than a first preset voltage value and the voltage value of the electrical signal corresponding to the ambient temperature is greater than a second preset voltage value;

[0053] The switch module 40 is used to conduct the power supply circuit between the power supply and the alarm module 50 when receiving the conduction signal;

[0054] The alarm module 50 is used to send a fire alarm to the construction site when the power supply circuit is turned on.

[0055] It should be noted that the smoke detection module 10 is specifically used to detect smoke particles in the air at the construction site. The change in the concentration of smoke particles will be converted into an electrical signal and transmitted to the first input terminal of the controller 30. Its function is to monitor dust and smoke that may be generated by construction activities (such as cutting, welding, etc.) to prevent these interference factors from affecting the accuracy of the fire alarm system. The smoke detection module 10 can use a photoelectric or ion detector. Taking a photoelectric detector as an example, it works on the principle of light scattering. When smoke particles enter the detection chamber, they scatter the light emitted by the detector, and the scattered light is received by the photoelectric receiver and converted into an electrical signal. The temperature detection module 20 is used to measure the ambient temperature of the construction site and convert the temperature signal into an electrical signal and transmit it to the second input terminal of the controller 30. It can effectively detect temperature changes caused by fire. The temperature detection module 20 can use technologies such as thermocouples, thermistors or infrared sensors. These sensors can convert temperature changes into electrical signals and transmit them to the controller 30 for analysis. Different temperature thresholds can be set according to different construction environments and material properties. For example, in areas involving flammable materials, a lower temperature alarm threshold can be set. In addition to the absolute temperature value, the advanced temperature detection module 20 can also monitor the rate of change of temperature. A sudden rapid rise in temperature may indicate the early stages of a fire. By arranging multiple temperature sensors at the construction site, a temperature distribution map of the entire area can be created, which helps to quickly locate abnormal heat sources. The temperature detection module 20 can also be automatically calibrated according to the current season, time and weather conditions to ensure accuracy in different environments. The function of the controller 30 is to receive electrical signals from the smoke detection module 10 and the temperature detection module 20, and compare whether the voltage values ​​of these signals exceed the preset threshold. When the voltage value of the electrical signal of the smoke particle concentration is greater than the first preset voltage value, and the voltage value of the electrical signal of the ambient temperature is greater than the second preset voltage value, the controller 30 will output a conduction signal. When the switch module 40 receives the conduction signal, it will conduct the circuit between the power supply and the alarm module 50 to ensure that the alarm module 50 can work normally. Once the switch module 40 conducts the power supply circuit, the alarm module 50 will issue a fire alarm to the construction site. Its function is to notify the on-site personnel in a timely manner to prevent safety hazards caused by false alarms or missed alarms. This system decides whether to sound a fire alarm by comprehensively considering smoke concentration and temperature changes, effectively reducing the risk of false alarms caused by dust and smoke interference at the construction site, thereby improving the reliability and accuracy of the fire alarm system.

[0056] Furthermore, the smoke detection module 10 includes a light emitting diode D1 and a photoelectric receiver, and the smoke particles in the air of the construction site are detected, and an electrical signal corresponding to the concentration of the smoke particles is output to the controller 30, including:

[0057] The light emitting diode D1 and the photoelectric receiver detect the scattered light intensity, incident light intensity, scattering coefficient and optical path length of smoke particles in the air at the construction site of the building project;

[0058] Determine the smoke concentration through a relationship expression between the light scattering intensity and the smoke concentration based on the scattered light intensity, the incident light intensity, the scattering coefficient and the optical path length, and output an electrical signal corresponding to the smoke particle concentration to the controller 30;

[0059] The relationship between the light scattering intensity and the smoke concentration is expressed as:

[0060] I=I0·e -kcd ;

[0061] Where I is the scattered light intensity, I0 is the incident light intensity, k is the scattering coefficient, C is the smoke particle concentration, and d is the optical path length.

[0062] It should be noted that the scattered light intensity refers to the light intensity received by the photoelectric receiver after being scattered by smoke particles. It increases with the increase of smoke concentration and is affected by the size, shape and composition of smoke particles. The incident light intensity refers to the original light intensity emitted by the light-emitting diode D1. It is a fixed value determined by the specifications of the light-emitting diode D1. It may decay slightly over time and needs to be calibrated regularly. The scattering coefficient refers to the ability of smoke particles to scatter light. It is related to the size, shape and composition of smoke particles. Different types of smoke have different scattering coefficients. The concentration of smoke particles refers to the mass of smoke particles per unit volume of air. It is the ultimate goal of detection and is directly related to the assessment of fire risk. The optical path length refers to the distance that light travels in the detection space. It is a physical parameter of the detector. It is usually fixed and affects the detection sensitivity. A longer optical path can improve the sensitivity. The relationship between these parameters is that when the concentration of smoke particles increases, the scattered light intensity will increase. A higher scattering coefficient means that the same concentration of smoke will produce stronger scattered light. A longer optical path length can increase detection sensitivity, but it may also increase environmental interference. The stability of the incident light intensity is crucial for accurate measurement. In practical applications, these parameters need to be adjusted and optimized according to the specific construction environment and requirements. For example, in dusty construction environments, it may be necessary to increase the scattered light intensity threshold to avoid false alarms. For storage areas for flammable and explosive materials, it may be necessary to set a lower smoke concentration threshold to improve safety. In large space construction, it may be necessary to use multiple detectors or increase the optical path length to ensure full coverage. Through precise control and analysis of these parameters, a highly accurate and reliable smoke detection system can be built to provide strong protection for the safety of construction projects.

[0063] Furthermore, the fire alarm system device for building engineering construction further includes: a wireless communication module 80;

[0064] The wireless communication module 80 is connected to the controller 30 and the terminal device respectively;

[0065] The controller 30 is also used to output a fire alarm signal at the construction site of the building project to the wireless communication module 80 when the power supply circuit is turned on;

[0066] The wireless communication module 80 is used to send the fire alarm information to the terminal device by wireless transmission when receiving the fire alarm signal.

[0067] It should be noted that, in addition to the signal processing and analysis functions mentioned above, the controller 30 now also assumes the task of transmitting fire alarm signals to the wireless communication module 80. When the power supply circuit is turned on (i.e., a fire risk is detected), the controller 30 generates a fire alarm signal. The wireless communication module 80 is connected to the controller 30 and the terminal device. Receive the fire alarm signal from the controller 30. Convert the fire alarm information into a wireless signal and send it to the terminal device. The terminal device can be a smart phone, a tablet computer, a dedicated receiver, etc. Receive the fire alarm information from the wireless communication module 80. The advantage of this design is that the fire alarm can be quickly transmitted to the relevant personnel, the receiving alarm is not restricted by the location, and the alarm can be sent to multiple terminal devices at the same time, which is easy to integrate into a larger building management system. For example, on a construction site covering a large area, the project manager and the safety supervisor can receive fire alarms from various areas in real time through the mobile phone app. In the construction of high-rise buildings, even if the staff is not on site, they can be informed of the fire alarm on any floor in time through the terminal device. For large construction companies, a central monitoring center can be established to receive fire alarm information from multiple construction sites through wireless communication. During night construction, even if the on-site personnel are limited, the continuity of safety monitoring can be ensured through the wireless communication system. Once a fire alarm is received, the person in charge of safety can quickly coordinate an evacuation plan through the terminal device. Fire alarm information can also be sent to other intelligent systems on the construction site at the same time, such as automatically shutting down certain equipment and starting emergency lighting. All alarm information can be recorded on the terminal device for subsequent analysis and improvement of safety measures. In addition to sending to the mobile terminal, the sound and light alarm on site can also be triggered at the same time to achieve multiple protections. Through this advanced wireless communication system, fire alarms in construction projects have become more efficient and reliable, greatly improving the safety of the construction site and providing better protection for workers.

[0068] Furthermore, the device further comprises a solar panel 90 and a power battery 100, wherein the solar panel 90 is connected to the controller 30 and the power battery 100 respectively, and the power battery 100 is connected to the controller 30;

[0069] The controller 30 is further used to detect the battery power of the power battery 100 , and when the battery power of the power battery 100 is less than a preset battery power, control the solar panel 90 to charge the power battery 100 .

[0070] It should be noted that, in addition to processing fire alarm signals and wireless communication functions, the controller 30 is also responsible for monitoring and managing the power of the power battery 100. The solar panel 90 converts sunlight into electrical energy through the photovoltaic effect. Charge the power battery 100 and provide renewable energy for the system. The power battery 100 stores the electrical energy generated by the solar panel 90. Provide power for the controller 30 and other system components. Specifically, the controller 30 continuously monitors the power of the power battery 100. Set a preset battery power value as the lower limit. When the battery power is lower than the preset value, the controller 30 automatically starts the charging function of the solar panel 90. Ensure that the power battery 100 is sufficiently charged to maintain the normal operation of the system. The connection between the solar panel 90 and the power battery 100 and the controller 30 realizes automatic management and optimization of energy. The controller 30 can adjust the charging strategy according to actual conditions to ensure the reliability of the system. Use solar energy as the main power source to reduce dependence on traditional electricity. Reduce the carbon footprint of the system. The solar panel 90 provides sustainable power to ensure that the system can operate normally without a power grid. The power battery 100 can ensure the stability of the system when solar energy cannot provide enough power. It is particularly suitable for construction sites or remote areas far from the power grid. It avoids the risk of system downtime due to power supply problems. The maintenance cost of solar panels 90 and power batteries 100 is relatively low. It saves the cost of external power supply in the long term. For example, at a remote construction site without grid access, the system can be powered entirely by solar energy and batteries. In a temporary construction area, the solar energy system can provide an independent power source without relying on on-site power facilities. The power battery 100 can store the power collected by solar energy during the day to ensure that the system can still work normally at night or in rainy weather. If the power grid fails, the system can still provide power through the battery to ensure the continuity of the fire alarm function. In smart buildings, the solar power supply system can be integrated with the building management system to provide power support. Ensure that the installation location of the solar panel 90 is unobstructed to maximize the reception of sunlight. Use efficient photovoltaic components to improve energy conversion efficiency. Select high-performance and durable power batteries 100 to ensure long-term stable power supply. Check the battery status regularly to ensure its healthy operation. Set a reasonable lower limit of battery power according to actual usage and battery characteristics to ensure the stability of the system. Consider backup power or emergency batteries in the system to further improve the reliability of the system. Regularly check and maintain the solar panels 90 and the power battery 100 to ensure their normal operation. Through these measures, it can be ensured that the fire alarm system can operate stably in various environments, provide reliable fire monitoring and alarm functions, and achieve the goal of green environmental protection.

[0071] Furthermore, the fire alarm system device for building engineering construction further includes: a voltage dividing module 60 and a voltage stabilizing module 70;

[0072] The voltage dividing module 60 is connected to the power supply and the voltage stabilizing module 70 respectively, and the voltage stabilizing module 70 is connected to the light detecting module;

[0073] The voltage dividing module 60 is used to divide the power supply voltage provided by the power supply to obtain a divided voltage, and send the divided voltage to the voltage stabilizing module 70;

[0074] The voltage stabilizing module 70 is used to stabilize the divided voltage and send the stabilized divided voltage to the temperature detection module 20;

[0075] The temperature detection module 20 is further used to adjust the divided voltage after stabilization to obtain an electrical signal corresponding to the ambient temperature.

[0076] It should be noted that the voltage divider module 60 receives the original power supply voltage from the power supply. The power supply voltage is divided into different voltage levels according to the requirements, that is, the voltage divider voltage, which can be implemented using a resistor voltage divider network. The voltage stabilization module 70 receives the output of the voltage divider module 60, that is, the voltage divider voltage. A voltage stabilization circuit (such as a linear regulator or a switching regulator) is used to stabilize the voltage, eliminate the voltage fluctuation caused by power supply fluctuations or circuit load changes, and output a stable voltage. The temperature detection module 20 receives the stable voltage provided by the voltage stabilization module 70. The module may include one or more temperature sensors. The sensor converts the actual ambient temperature into an electrical signal and adjusts it by the voltage after stabilization. The temperature detection module 20 sends the obtained electrical signal to the controller 30 for subsequent analysis and processing. The voltage stabilization module 70 can ensure that the temperature detection module 20 can also obtain a stable power supply when the voltage fluctuates, thereby improving the accuracy of the measurement result. Voltage division and voltage stabilization can meet the requirements of different power supply voltages and provide a suitable power supply for the temperature detection module 20. By dividing and stabilizing the power supply voltage, the impact of unstable power supply on the entire system is reduced.

[0077] Further, the temperature detection module 20 includes: a first resistor R1, which is a thermistor;

[0078] The first end of the first resistor R1 is connected to the power supply through the voltage stabilizing module 70 and the voltage dividing module 60 , and the second end of the first resistor R1 is connected to the second input end of the controller 30 .

[0079] It should be noted that the power supply is divided by the voltage divider module 60, and then the voltage regulator module 70 stabilizes the voltage after the voltage division. The stabilized voltage is provided to the thermistor (first resistor R1). The resistance value of the thermistor changes with the ambient temperature. When the ambient temperature changes, the resistance value of the thermistor also changes, resulting in a change in the voltage drop when the current passes through the thermistor. The second end of the thermistor is connected to the second input end of the controller 30. The controller 30 measures the change in resistance value by reading the voltage value across the thermistor, thereby calculating the ambient temperature. The controller 30 converts the acquired electrical signal into a temperature value and compares it with a preset threshold value to determine whether there is a dangerous situation such as a fire. The thermistor is very sensitive to temperature changes and can provide high-precision temperature measurement. The voltage regulator module 70 ensures that the thermistor obtains a stable power supply, thereby improving the accuracy of the measurement. The thermistor has a simple structure, is easy to integrate into a circuit, and has a low cost.

[0080] Furthermore, the controller 30 includes: a first comparator A1, a second comparator A2 and an AND gate AND;

[0081] Among them, the positive input end of the first comparator A1 is connected to the second end of the first resistor R1, the negative input end of the first comparator A1 is connected to the first preset reference power supply, the output end of the first comparator A1 is connected to the first input end of the AND gate AND, the positive input end of the second comparator A2 is connected to the smoke detection module 10, the negative input end of the second comparator A2 is connected to the second preset reference power supply, the output end of the second comparator A2 is connected to the second input end of the AND gate AND, and the output end of the AND gate AND is connected to the switch module 40.

[0082] It should be noted that the positive input terminal of the first comparator A1 is connected to the second terminal of the thermistor to receive the voltage signal output by the thermistor. The reverse input terminal is connected to the first preset reference power supply for setting a temperature threshold, and the output terminal is connected to the first input terminal of the AND gate AND. The positive input terminal of the second comparator A2 is connected to the smoke detection module 10 to receive the signal from the smoke sensor, the reverse input terminal is connected to the second preset reference power supply for setting a smoke concentration threshold, and the output terminal is connected to the second input terminal of the AND gate AND. The AND gate AND has two input terminals, which are respectively connected to the output terminals of the first comparator A1 and the second comparator A2. The output terminal is connected to the switch module 40 for controlling the alarm device or other related functions.

[0083] Specifically, the resistance value of the thermistor (first resistor R1) changes with the ambient temperature. The first comparator A1 compares the voltage signal of the thermistor with the voltage of the first preset reference power supply. If the voltage of the thermistor is higher than the preset reference voltage (indicating that the ambient temperature exceeds the set threshold), the first comparator A1 outputs a high level signal, otherwise it outputs a low level signal. The smoke detection module 10 detects the smoke concentration in the environment. The second comparator A2 compares the signal of the smoke detection module 10 with the voltage of the second preset reference power supply. If the smoke detection signal exceeds the preset reference voltage (indicating that the smoke concentration exceeds the set threshold), the second comparator A2 outputs a high level signal, otherwise it outputs a low level signal. The two input ends of the AND gate AND receive the output signals from the first comparator A1 and the second comparator A2 respectively. The output end of the AND gate AND outputs a high level signal only when both input signals are high. In this way, the output of the AND gate AND will be high only when the ambient temperature exceeds the threshold and the smoke concentration exceeds the threshold. The output end of the AND gate AND is connected to the switch module 40. The switch module 40 controls the switch state of the alarm device according to the output signal of the AND gate AND. When the output of the AND gate AND is high, the switch module 40 can trigger the alarm device and sound an alarm to notify that there is a fire risk. By setting the threshold value through the comparator, the abnormal conditions of temperature and smoke concentration can be accurately detected. The AND gate AND logic ensures that the alarm is triggered only when both conditions are met at the same time, reducing false alarms. The combination of two independent comparators and the AND gate AND can ensure the high reliability of the system and avoid false alarms caused by single sensor failure. By adjusting the reference voltage of the comparator, the alarm thresholds of temperature and smoke can be flexibly set.

[0084] Furthermore, the switch module 40 includes: a first switch tube Q1 and a second resistor R2;

[0085] Among them, the first end of the second resistor R2 is connected to the power supply, the second end of the second resistor R2 is connected to the input end of the first switch tube Q1, the control end of the first switch tube Q1 is connected to the output end of the AND gate AND, and the output end of the first switch tube Q1 is connected to the alarm module 50.

[0086] It should be noted that the first switch tube Q1 is a device that can control the on and off of current, and can be a transistor (such as BJT, MOSFET, etc.). It has three ports: an input end (which may be a collector or source), a control end (base or gate), and an output end (emitter or drain). The second resistor R2 is an ordinary resistor used to limit current or divide voltage. One end of it is connected to the power supply, and the other end is connected to the input end of the switch tube. The first end of the second resistor R2 is connected to the power supply for providing current. The second end of the second resistor R2 is connected to the input end of the first switch tube Q1, so that the current of the power supply can flow into the switch tube through the resistor. The control end of the first switch tube Q1 is connected to the output end of the AND gate AND. The high and low level signals output by the AND gate AND will control the conduction and cutoff of the switch tube. The output end of the first switch tube Q1 is connected to the alarm module 50. When the switch tube is turned on, the current of the power supply can flow into the alarm module 50 through the switch tube, thereby triggering an alarm. When the AND gate AND outputs a high level signal, the control end of the first switch tube Q1 receives this signal, causing the switch tube to be turned on. Once the switch is turned on, the current of the power supply can flow into the alarm module 50 through the second resistor R2 and the switch, thereby activating the alarm. If the AND gate AND outputs a low level signal, the switch will be turned off, preventing the current from flowing to the alarm module 50, and the alarm will not be triggered.

[0087] Furthermore, the alarm module 50 includes: a light emitting diode D1 and a buzzer;

[0088] The output end of the first switch tube Q1 is connected to the anode of the light emitting diode D1 and the buzzer respectively, and the cathode of the light emitting diode D1 is grounded.

[0089] It should be noted that the light emitting diode D1 is used to provide a visual alarm, usually emitting a flashing light to attract attention. Its positive electrode is connected to the output end of the first switch tube Q1, and its negative electrode is grounded. The buzzer is used to issue an audible alarm to attract auditory attention. One end of the buzzer is connected to the output end of the first switch tube Q1, and the other end is usually grounded or grounded through a suitable resistor.

[0090] Further, the voltage dividing module 60 includes: a third resistor R3 and a fourth resistor R4, and the voltage stabilizing module 70 includes: a first capacitor C1;

[0091] Among them, the first end of the third resistor R3 is connected to the power supply, the second end of the third resistor R3 is connected to the first end of the fourth resistor R4, the first end of the fourth resistor R4 is also connected to the first end of the first resistor R1 and the first end of the first capacitor C1, and the second end of the fourth resistor R4 and the second end of the first capacitor C1 are grounded.

[0092] It should be noted that the third resistor R3 and the fourth resistor R4 form a voltage divider circuit. The power supply voltage is stepped down through the third resistor R3, and the voltage is transmitted from the second end of the third resistor R3 to the first end of the fourth resistor R4. The output voltage of the voltage divider circuit (the voltage at the second end of the fourth resistor R4) can be set by adjusting the resistance values ​​of the third resistor R3 and the fourth resistor R4. The function of the first capacitor C1 is to filter and stabilize the voltage. The capacitor is connected between the fourth resistor R4 and the ground, which helps to smooth the voltage and reduce the impact of power supply fluctuations or noise on the circuit. The characteristics of capacitor charging and discharging can reduce voltage fluctuations, making the voltage passing through the fourth resistor R4 more stable, and providing a stable reference voltage.

[0093] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0094] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A fire alarm system device for construction engineering, characterized in that: The device comprises: a smoke detection module, a temperature detection module, a controller, a switch module and an alarm module; The smoke detection module is connected to the first input terminal of the controller, the temperature detection module is connected to the second input terminal of the controller, the output terminal of the controller is connected to the switch module, and the switch module is connected to the power supply and the alarm module respectively; The smoke detection module is used to detect smoke particles in the air at the construction site of the building project and output an electrical signal corresponding to the concentration of the smoke particles to the controller; The temperature detection module is used to detect the ambient temperature of the construction site of the building project and output an electrical signal corresponding to the ambient temperature to the controller; The controller is used to output a conduction signal to the switch module when the voltage value of the electrical signal corresponding to the smoke particle concentration is greater than a first preset voltage value and the voltage value of the electrical signal corresponding to the ambient temperature is greater than a second preset voltage value; The switch module is used to conduct the power supply circuit between the power supply and the alarm module when receiving the conduction signal; The alarm module is used to send out a fire alarm at the construction site of the building project when the power supply circuit is turned on.

2. The fire alarm system device for construction engineering as claimed in claim 1, characterized in that: The smoke detection module includes a light emitting diode and a photoelectric receiver, which detects smoke particles in the air at the construction site of the building project and outputs an electrical signal corresponding to the concentration of the smoke particles to the controller, including: Detecting the scattered light intensity, incident light intensity, scattering coefficient and optical path length of smoke particles in the air at the construction site of the building project by means of the light emitting diode and the photoelectric receiver; Determine the smoke concentration through a relationship expression between the light scattering intensity and the smoke concentration based on the scattered light intensity, the incident light intensity, the scattering coefficient and the optical path length, and output an electrical signal corresponding to the smoke particle concentration to the controller; The relationship between the light scattering intensity and the smoke concentration is expressed as: Ⅰ=I0 e -kcd ; Where I is the scattered light intensity, I0 is the incident light intensity, k is the scattering coefficient, c is the smoke particle concentration, and d is the optical path length.

3. The fire alarm system device for construction engineering as claimed in claim 2, characterized in that: The fire alarm system device for building engineering construction further includes: a wireless communication module; The wireless communication module is connected to the controller and the terminal device respectively; The controller is further configured to output a fire alarm signal at the construction site of the building project to the wireless communication module when the power supply circuit is turned on; The wireless communication module is used to send the fire alarm information to the terminal device by wireless transmission when receiving the fire alarm signal.

4. The fire alarm system device for construction engineering as claimed in claim 3, characterized in that: The device further comprises a solar panel and a power battery, wherein the solar panel is connected to the controller and the power battery respectively, and the power battery is connected to the controller; The controller is also used to detect the battery power of the power battery, and when the battery power of the power battery is less than a preset battery power, control the solar panel to charge the power battery.

5. The fire alarm system device for construction engineering as claimed in claim 4, characterized in that: The fire alarm system device for building engineering construction also includes: a voltage dividing module and a voltage stabilizing module; Wherein, the voltage dividing module is connected to the power supply and the voltage stabilizing module respectively, and the voltage stabilizing module is connected to the light detection module; The voltage dividing module is used to divide the power supply voltage provided by the power supply to obtain a divided voltage, and send the divided voltage to the voltage stabilizing module; The voltage stabilization module is used to stabilize the divided voltage and send the stabilized divided voltage to the temperature detection module; The temperature detection module is also used to adjust the divided voltage after stabilization to obtain an electrical signal corresponding to the ambient temperature.

6. The fire alarm system device for construction engineering as claimed in claim 5, characterized in that: The temperature detection module includes: a first resistor, which is a thermistor; The first end of the first resistor is connected to the power supply through the voltage stabilizing module and the voltage dividing module, and the second end of the first resistor is connected to the second input end of the controller.

7. The fire alarm system device for construction engineering as claimed in claim 6, characterized in that: The controller comprises: a first comparator, a second comparator and an AND gate; Wherein, the positive input terminal of the first comparator is connected to the second terminal of the first resistor, the reverse input terminal of the first comparator is connected to a first preset reference power supply, the output terminal of the first comparator is connected to the first input terminal of the AND gate, the positive input terminal of the second comparator is connected to the smoke detection module, the reverse input terminal of the second comparator is connected to the second preset reference power supply, the output terminal of the second comparator is connected to the second input terminal of the AND gate, and the output terminal of the AND gate is connected to the switch module.

8. The fire alarm system device for construction engineering as claimed in claim 7, characterized in that: The switch module includes: a first switch tube and a second resistor; Among them, the first end of the second resistor is connected to the power supply, the second end of the second resistor is connected to the input end of the first switch tube, the control end of the first switch tube is connected to the output end of the AND gate, and the output end of the first switch tube is connected to the alarm module.

9. The fire alarm system device for construction engineering as claimed in claim 8, characterized in that: The alarm module includes: a light emitting diode and a buzzer; The output end of the first switch tube is connected to the anode of the light emitting diode and the buzzer respectively, and the cathode of the light emitting diode is grounded.

10. The fire alarm system device for construction engineering as claimed in claim 9, characterized in that: The voltage dividing module includes: a third resistor and a fourth resistor, and the voltage stabilizing module includes: a first capacitor; Among them, the first end of the third resistor is connected to the power supply, the second end of the third resistor is connected to the first end of the fourth resistor, the first end of the fourth resistor is also connected to the first end of the first resistor and the first end of the first capacitor, and the second end of the fourth resistor and the second end of the first capacitor are grounded.

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